File content as of revision 0:63fac75e5afc:

/* mbed Microcontroller Library
 * Copyright (c) 2019 ARM Limited
 * SPDX-License-Identifier: Apache-2.0
 */

#include "mbed.h"
#include "platform/mbed_thread.h"
#include <SPI.h>

//SETUP THE LTC CHIP
#define LTC_MOSI    PB_2
#define LTC_MISO    PC_11
#define LTC_CLK     PC_10
#define LTC_CS      PA_15
#define BSY         PB_5
#define CNV         PB_6

#define DATA_LEN    144 //bits of data we will transmit 6-ch 24 bits/ch
#define BUFF_SIZE   9   // 9, 16-bit words will come through

SPI LTC_CHIP(LTC_MOSI, LTC_MISO, LTC_CLK);
DigitalOut cs_LTC(LTC_CS);
DigitalIn bsy_LTC(BSY);
DigitalOut CNV_PIN(CNV);

//SETUP REGISTERS
uint16_t rx_buff[DATA_LEN]; //want to read 144 bits (literally bits) 

//setup SERIAL
Serial       pc(USBTX, USBRX);

/*
We need to 
- pull CS low
- read the data into a register
- release CS
- decode the data
- repeat
*/

void read_data() {
    //request conversion
    CNV_PIN=1;
    wait_us(60);
    CNV_PIN=0;
    //WAIT FOR BSY --> bsy_LTC
    //while(bsy_LTC==1){}
    //then ask for data
    //cs_LTC=0;
    //spi id register
    //LTC_CHIP.write(0x00); // --> do we need this? 
    //read 144 bytes
    
    /*
    
    int bytecount = 0;
    while(bytecount < BUFF_SIZE){
        rx_buff[bytecount] = LTC_CHIP.write(0x00);
        bytecount++;
    }
    */
    
    //lift CS
    //cs_LTC=1;

    //WRITE THIS TO A STRUCT OF SOME SORT but we need to delete the bits we don't care about
}


int main()
{
    // Initialise the digital pin LED1 as an output
    DigitalOut led(LED1);
    cs_LTC=0;
    CNV_PIN=0;
    
    //setup pc
    pc.baud(115200);
    pc.printf("------STARTUP------\n\n\n");
    
    //setup SPI
    LTC_CHIP.format(16, 0);
    LTC_CHIP.frequency(1000000); //60Mhz clock frequency 
    
    while (true) {
        //read and print data to serial terminal
        read_data();
        //print the spi bytes
        /*
        pc.printf("first int: %d\n", rx_buff[0]); //just check the first "word" for now b/c it should be correct
        pc.printf("second int: %d\n", rx_buff[1]);
        pc.printf("third int: %d\n", rx_buff[2]);
        pc.printf("fourth int: %d\n", rx_buff[3]);
        pc.printf("fifth int: %d\n", rx_buff[4]);
        pc.printf("sixth int: %d\n", rx_buff[5]);
        pc.printf("seventh int: %d\n", rx_buff[6]);
        pc.printf("eight int: %d\n", rx_buff[7]);
        */
        //wait for 1 second
        wait(1);
    }
}